One of the reasons why VCRs are so difficult to use is that ______.
A.the desirers are often insensitive to the operational complexities of their machines
B.the range of features provided is unlimited
C.there is no ideal way of controlling quality
D.their designers often ignore the complaints of their uses
第3题
A.结石为输尿管梗阻最常见的原因
B.前列腺增生是老年男性尿路梗阻的最常见原因
C.尿道狭窄是尿道梗阻的最常见原因
D.肾积水的最常见原因为肾下垂
第8题
A.结石为输尿管梗阻的最常见原因
B.前列腺增生是老年男性尿路梗阻的最常见原因
C.尿道狭窄是尿道梗阻的最常见原因
D.先天性后尿道瓣膜是男婴尿道梗阻的重要原因
E.肾积水的最常见原因为肾下垂
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